I agree with you, but finding reading material is difficult.
Which aircraft do you fly?
My wiring schematics for the Boeing 767 show the label "Alt (29.92)" coming from the Air Data Computers to the ATC Transponders (which the TCAS uses).
Wiring schematics for the 744 and 737NG show both Altitude and Baro-corrected Altitude data on the data busses coming from the ADC's/ADIRU's, but the label going into the ATC is simply "Altitude". Not really conclusive, however.
I must admit I was surprised to see, in the 744's schematics, baro correction coming from the Standby Altimeter going to all the ADC's. I have no idea what it's used for.
Rgds.
NSEU
Last edited by NSEU; 2nd October 2008 at 21:36.